Accession Number : ADA302448

Title :   DC-10 Composite Vertical Stabilizer Ground Test Program.

Descriptive Note : Contract rept. Dec 80-May 82,

Corporate Author : MCDONNELL DOUGLAS CORP LONG BEACH CA DOUGLAS AIRCRAFT DIV

Personal Author(s) : Palmer, J. M., Jr. ; Stephens, C. O. ; Sutton, J. O.

PDF Url : ADA302448

Report Date : AUG 1983

Pagination or Media Count : 39

Abstract : A review of the structural configuration and ground test program is presented. Particular emphasis is placed on the testing of a full-scale stub box test subcomponent and a full span ground test unit. The stub box subcomponent was tested in an environmental chamber under ambient, cold/wet, and hot/wet conditions. The test program included design limit static loads, fatigue spectrum loading to approximately two service lifetimes (with and without damage), design limit damage tolerance tests, and a final residual strength test to a structural failure. The first full-scale ground test unit was tested under ambient condition. The test unit was to have undergone static, fatigue, and damage tolerance tests but a premature structural failure occurred at design limit load during the third limit load test. A failure theory was developed which explains the similarity in types of failure and the large load discrepancy at failure between the two test articles. The theory attributes both failures to high stress concentrations at the edge of the lower rear spar access opening. A second full-scale ground test unit has been modified to incorporate the various changes resulting from the premature failure. The article has been assembled and is active in the test program. (MM)

Descriptors :   *AERODYNAMIC CONFIGURATIONS, *LAMINATES, *TRANSPORT AIRCRAFT, *VERTICAL STABILIZERS, FLIGHT TESTING, FIBERGLASS, COMPOSITE MATERIALS, LOADS(FORCES), STATIC LOADS, STRUCTURAL ANALYSIS, DAMAGE ASSESSMENT, COMPOSITE STRUCTURES, BENDING, STRENGTH(MECHANICS), TEMPERATURE GRADIENTS, ALUMINUM, SHEAR STRESSES, BUCKLING, BONDING, FATIGUE(MECHANICS), TITANIUM, ASSEMBLY, TOLERANCES(MECHANICS), FAILURE(MECHANICS), FASTENINGS, HUMIDITY, TORSION, HONEYCOMB CORES, STRESS CONCENTRATION.

Subject Categories : Aerodynamics
      Commercial and General Aviation
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE